public void RaiseCanExecuteChangedTest()
{
var executed = false;
var canExecute = false;
var command = new DelegateCommand(() => executed = true, () => canExecute);
Assert.IsFalse(command.CanExecute(null));
canExecute = true;
Assert.IsTrue(command.CanExecute(null));
AssertHelper.CanExecuteChangedEvent(command, () => command.RaiseCanExecuteChanged());
Assert.IsFalse(executed);
}
public void MemoryTest()
{
DelegateCommand command = new DelegateCommand(() => { });
MockView view1 = new MockView();
command.CanExecuteChanged += view1.CanExecuteChangedHandler;
command.RaiseCanExecuteChanged();
Assert.IsTrue(view1.CanExecuteChangedHandlerCalled);
// Check that view1 is collected by the garbage collector.
WeakReference weakReference = new WeakReference(view1);
view1 = null;
GC.Collect();
Assert.IsFalse(weakReference.IsAlive);
MockView view2 = new MockView();
command.CanExecuteChanged += view2.CanExecuteChangedHandler;
command.RaiseCanExecuteChanged();
Assert.IsTrue(view2.CanExecuteChangedHandlerCalled);
// Check that after unwiring view2 the eventhandler is not called anymore.
command.CanExecuteChanged -= view2.CanExecuteChangedHandler;
view2.Clear();
command.RaiseCanExecuteChanged();
Assert.IsFalse(view2.CanExecuteChangedHandlerCalled);
}
